A utility to help maintain a wheelhouse.
Wheelhouse is a utility to help maintain a wheelhouse.
What is a Wheelhouse?
A wheelhouse is a local cache of python packages in wheel format that gets committed with your code to your VCS. When installing packages during continuous integration and production, the wheels in the wheelhouse are used instead of depending on PyPI or some other network location.
- Wheels are stored in your DVCS bringing further clarity to exactly what packages are needed/expected and how they have changed over time.
- CI builds are faster and more consistent. Due to the increased speed of installing wheels from a local cache instead of pulling them from a network location, we can have tox start with a new virtualenv before every run, thereby insuring all dependencies have been specified and installed into the wheelhouse correctly.
- Production deployments are similarly fast and consistent. Since the CI and production servers both pull from the same wheelhouse we have higher certainty that our production code is running against the exact same packages that have been tested.
- Since wheels are built on development or build machines, the need for development system packages to be installed on production servers is removed.
- Targeting forks, development versions, unpublished, and/or private software for production is much easier than setting up & maintaining a private PyPI server like devpi.
- Splits the package management process into two distinct steps:
- Build packages (from various locations, with specified version) and put wheels in the wheelhouse.
- Install the latest version of a package from the wheelhouse.
- Some may be opposed to storing binary packages in version control.
- More disk space is needed for the binary packages.
- The wheelhouse will accumulate packages if not cleaned up regularly. The
purgecommand can help with this.
Build/Refresh the Wheelhouse
This will build wheels and store them in the wheelhouse for any updated packages:
Setting Up an Environment
Create a temporary virtualenv with packages installed from the wheelhouse:
vex -mr myproj # or: mktmpenv wheelhouse install -- -r requirements/dev-env.txt pip install -e .
Your virtualenv now contains the same packages as the wheelhouse. By using temporary environments you force yourself to always work with what is in the wheelhouse. Getting a package into your development environment requires you to go throught the wheelhouse to do it. This means maintaining the project’s packages becomes a first-priority issue in every developers workflow.
The code for this project is rather basic, but it’s the concept that counts. Putting the concept of a wheelhouse into practice has made managing dependencies for our projects across dev, testing and production environments much, much easier.
Checkout Keg to see a project which is using a wheelhouse in conjunction with tox to manage dependencies.
build: Will build all packages for all requirements file specified in the config file and store in the wheelhouse directory. Can also be passed the names of individual packages or aliases.
config: display the configuration
purge: purge the wheelhouse of any wheel that isn’t the most recent version in the wheelhouse for that package.
Possible Future Features:
install: install a package/wheel from the wheelhouse.
status: compare the working environment’s installed packages with the requirement files, the wheelhouse, and package indexes (PyPI) and show where they are out of sync.
Once you have a wheelhouse (
wheelhouse build), you can tell pip to install only from the
wheelhouse. To do that with environment variables and a tox.ini, it would look like:
# tox.ini [testenv] setenv = PIP_USE_WHEEL=true PIP_NO_INDEX=true PIP_FIND_LINKS=requirements/wheelhouse
or, from the command line:
pip install --use-wheel --no-index --find-links=requirements/wheelhouse -r requirements/testing.txt
You must place a
wheelhouse.ini in the base of your project. This is considered the “project
root” and all relative file paths are calculated from this location.
You may also place a
wheelhouse.ini file in a user-specific location to override defaults for
wheelhouse config for more information.
Config files are read by a SafeConfigParser instance. See the linked docs for interpolation support available.
An example configuration file follows:
[wheelhouse] # These files are relative to the project's requirements directory (default: `requirements/`). requirement_files = build.txt # Make sure each package has a wheel built for python 2 & 3. pip_bins = pip, pip3.4 [aliases] # Shortcuts to be used when specifying projects to `build`. keg = https://github.com/level12/keg/zipball/master ke = https://github.com/level12/keg-elements/zipball/master
Issues & Discussion
Please direct questions, comments, bugs, feature requests, etc. to: https://github.com/level12/wheelhouse/issues
Very Beta, expect changes.
To develop on this project, begin by running our tests:
git clone https://github.com/level12/wheelhouse wheelhouse-src cd wheelhouse-src tox
You can then examine tox.ini for insights into our development process. In particular, we:
py.testfor testing (and coverage analysis)
piprequirements files in
- cache wheels in
requirements/wheelhousefor faster & more reliable CI builds
Adding a dependency involves:
- If it’s a run-time dependency, add to
- Adding the dependency to one of the requirements files in
When updating the readme, use
restview --long-description to preview changes.
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